SCUSHIFT - Correct for data shift error in demodulated data files

Description:

This script corrects for the DAQ communications error and shifts the data from ADC cards along by a specified amount. Since all channels are read from a particular ADC card but only some of them are actually stored in the demodulated data file, the shift may result in fewer bolometers being stored for a given sub-instrument.

Usage:

scushift [-h] NDF card shift

Parameters:

-h

Help information

NDF (Given)

The input files to be modified.

card

The letter identifying the A-to-D card (allowed values are A to I)

shift

The number of bolometers to shift by. A negative shift moves D1 to D16 (for example) and a positive shift D1 to D2. In most cases a negative shift is required (usually $-1$).

Examples:

scushift test i -2

Move the I card data of test.sdf by minus 2 bolometers

scushift test2 h 1

Move the H-card data by plus 1 bolometer.

Notes:

• extinction must not have been run on the input NDF.

• Arguments are requested if they are missing from the command line

• If the system stores channels 1,2,3,6,7,8,10 but we know that we have a shift of $-1$ in the system (ie an extra byte is present). This implies that we have actually stored channels 16,1,2,5,6,7,9 and if only bolometers 1,2,6,7 are from the required sub-instrument we have to throw away data from channels 15,5 and 9.

• The DAQ hardware fault always introduced extra bytes and therefore a negative shift should be used in scushift.

• Currently photometry data is not corrected properly (the PHOT_BB extension is not modified so the correct bolometer will not be extracted by scuphot). This can be overcome by using the ALLBOLS parameter in scuphot.